Dialing down the RPM’s may allow the engine … Safety Boats can explode. cracked cylinder head, or warped cylinders) and subsequent cost to repair will be far greater than repairing the issues that cause the overheating … You can do even more damage to the engine by immediately shutting down an overheated engine! However, the outboard motor is a durable part but there are some factors that can damage it and one of the most common among them is Overheating.. With the increase in temperature, the problem of outboard motor overheating … Even mild overheating can cause serious damage to expensive engine … Given the strong performance of the engine, could the fuel mixture of the LOWER cylinder be lean enough to cause a lubrication problem or an overheat damage problem ? 3. Marine diesels should run at 180 degrees Fahrenheit. Given that we normally used the boat … Overheating is a common symptom of marine diesel engine blockage. Engine Overheat Troubleshooting Excessive overheating can ruin your engine. ... Overheating can cause serious damage to your engine. ... NEVER run the engine without a thermostat installed or you will cause severe engine damage. Start at the intake seacock and work your way all the way through the engine to the water lift muffler to determine the reason for the overheating. Also because it is a tiller unit the water stream is behind you to the right side of the motor as you steer the boat … All marine engines use seawater to cool the engine. 2. When the temperature goes above 200, start getting worried. If your engine slows down from overheating, you have caused some damage. Outboard motors have a telltale stream of water emerging from under the cowl. … after initially having no water peeing out of my 1980,7.5hp mercury,i changed impeller,still no water.then opened up the exhaust cover( sheering 2 bolts in process) on inspection found the water … High temperatures break down lubricating oils and cause metal-to-metal grinding. A surprisingly common and easily overlooked one is failing to open the cooling water seacock after working on the engine… The Top 6 Reasons Boats Catch Fire Why do boats catch … Overheating is no minor issue: according to BoatUS Marine Insurance data, 9 percent of boat fires are caused by engine overheating. An overheated engine shouldn’t be ignored because the damage (eg. Questions: 1. One part might be responsible, or a number of parts can contribute to the overheating problem. Overheating problems in an inboard-outboard motor, also called a "stern-drive," happen as a result of component failure somewhere in the cooling system. 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